I concur (the part about being a duplicate question). A "subset", "sliding window over a list", or in Mathematica speak, a "sublist" are the same thing. Just did not show up in my query.
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mmorrisMay 11 '12 at 21:46

mmorris, is it OK with you if I close this question?
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Mr.Wizard♦May 11 '12 at 21:48

@Mr.Wizard: I like this question better, since OP showed some legwork, making this a better example of questions we'd like to see. How about closing the older one as a dupe of this instead?
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Ｊ. Ｍ.May 14 '12 at 13:06

@SjoerdC.deVries Don't see that in this case. Could be due to the use of @@ in your linked question, but someone else might be more qualified to answer that..
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rm -rf♦May 11 '12 at 20:53

On my PC I get about the same performance for Partition and PartitionMap in this situation. The link suffices to help us remember we shouldn't generalize from one data point.
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Sjoerd C. de VriesMay 11 '12 at 21:00

@SjoerdC.deVries PartitionMap will leave a list packed, provided that you don't do something to unpack it, like use Apply. Generally, I've found it quite fast.
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rcollyerMay 26 '12 at 1:57

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